ROYUAN Clock Spring A2129002730 / A2129007702 for Mercedes-Benz C-Class W204 / E-Class W212 (2007-2014) – Airbag Spiral Cable
ROYUAN
Premium Aftermarket Auto Parts – Safety & Reliability
Product Description – ROYUAN Clock Spring A2129002730 / A2129007702 for Mercedes-Benz C-Class W204 / E-Class W212
🔍 IMPORTANT – PLEASE READ
This ROYUAN clock spring (airbag spiral cable) is a critical safety component located behind the steering wheel. It maintains continuous electrical connection for the driver's airbag (SRS), horn, and steering wheel controls as the steering wheel turns.
⚠️ CRITICAL: Part numbers NOT verified in manufacturer catalogs. Fitment not guaranteed without physical comparison. Always visually compare the connector shape, pin configuration, and appearance with your original part before ordering. For 100% confirmation, contact us with your VIN or clear photos of your original clock spring.
OEM References (Unverified): A2129002730, A2129007702.
Return Policy: This electrical component is not returnable once installed. Please ensure compatibility before purchase.
Compatible Vehicles
| Make | Model / Chassis | Approx. Years | Notes |
|---|---|---|---|
| Mercedes-Benz | C-Class (W204) – C200K, C63 AMG, etc. | 2007–2014 | Sedan, coupe (C204), wagon. Verify connector and pin count. |
| Mercedes-Benz | E-Class (W212) – pre-facelift models | 2009–2014 | Sedan, wagon. Verify original part number. |
Technical Specifications
- Brand: ROYUAN – Premium aftermarket manufacturer
- Function: Clock spring / Airbag spiral cable
- Placement: Steering column, behind steering wheel
- Material: High-strength copper ribbon, flame-retardant ABS plastic housing
- OE Numbers (Reference): A2129002730, A2129007702
Key Functions
✅ Airbag (SRS) system activation – critical safety component
✅ Horn operation
✅ Steering wheel controls (audio, phone, cruise control, if equipped)
Signs of Failure
⚠️ Airbag warning light on dashboard
📢 Horn does not function
🎛️ Steering wheel controls unresponsive
🔊 Clicking/scratching noise when turning
🚨 Driver airbag may not deploy in collision
⚠️ IMPORTANT SAFETY NOTE & INSTALLATION TIPS
Before Installation: Disconnect battery negative terminal and wait at least 10 minutes for airbag discharge. Follow Mercedes-Benz safety procedures.
Centering: Keep front wheels straight. Do NOT remove centering clip until fully installed. If needed, turn rotor clockwise to stop, then back approximately 2.5 turns to center.
Verification: Compare connectors/pins with original. Provide VIN or photos for 100% confirmation. This part number may fit both W204 and W212 – verify your original clock spring appearance.
Post-Installation: Test horn, steering controls, and ensure airbag warning light turns off. Use diagnostic tool to clear faults if required.
Professional Installation: Strongly recommended due to airbag system risks.
Quality You Can Trust
- High-purity copper ribbon – stable signal
- Flame-retardant housing – safety certified
- 300,000-cycle endurance test (-40 C to +85 C)
- Centering clip included – do not remove early
- 1-year warranty
Package Includes: 1 x ROYUAN Clock Spring Assembly (with centering clip), installation guide on request.
